XMLHttpRequest of ajax

nbsp;      // error
        this.status = 404;
        this.statusText = ''Not Found'';
        this.responseText = '''';
        this.readyState = 4;
        if (this.onreadystatechange)
        {
          this.onreadystatechange();
        }
        if (this.onerror)
        {
          this.onerror();
        }
      }
    };
  };
}

// ActiveXObject emulation
if (!window.ActiveXObject && window.XMLHttpRequest)
{
  window.ActiveXObject = function(type)
  {
    switch (type.toLowerCase())
    {
      case ''microsoft.xmlhttp'':
        case ''msxml2.xmlhttp'':
        case ''msxml2.xmlhttp.3.0'':
        case ''msxml2.xmlhttp.4.0'':
        case ''msxml2.xmlhttp.5.0'':
        return new XMLHttpRequest();
    }
    return null;
  };
} 点此下载ajax.js